package com.atguigu.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.service.EduSubjectService;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;

public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {


    //因为SubjectExcelListener不能交给spring进行管理，需要自己new一个监听器，不能注入其他对象
    //不能用service，mappear实现数据库的操作
    //如何解决？？？
    //在方法中多传一个参数service
    //在new监听器的时候传过来service
    //之后可以用这个对象来操作数据
    public EduSubjectService subjectService;
    public SubjectExcelListener() {}
    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }


    //读取excel内容，一行一行进行读取
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {

        if (subjectData == null) {
            throw new GuliException(20001,"文件数据为空");
        }

        //一行一行进行读取，每次读取有两个值，第一个值一级分类，第二个值二级分类
        //判断一级分类是否重复
        EduSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
        if (existOneSubject == null) {  //表示没有相同的一级分类，进行添加
            existOneSubject = new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName());
            subjectService.save(existOneSubject);
        }

        //首先你要明白一行两个数据，有关系
        //解释一下：如果一行一行读取，有这个一级分类的话，会查出来，那么一级分类不会添加，但是查出来后可以得到他的id
        //如果没有的话查不出来，会创建一个新的，也会有id值，所以可以用
        String pid = existOneSubject.getId();
        //调用方法判断二级分类是否重复
        EduSubject existTwoSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName(), pid);
        if (existTwoSubject == null) {
            existTwoSubject = new EduSubject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());
            subjectService.save(existTwoSubject);
        }
    }



    //判断一级分类不能重复添加
    private EduSubject existOneSubject(EduSubjectService eduSubjectService,String name){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id","0");
        //这是一个一个进行查询的
        EduSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }

    //判断二级分类不能重复添加
    private EduSubject existTwoSubject(EduSubjectService eduSubjectService,String name,String pid){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id",pid);
        //这是一个一个进行查询的
        EduSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }


    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
